Which of the relations given by the following sets of ordered pairs is a function? {(5,4), (5,6), (5,8), (5,10), (5,12)}
{(5,2), (-4,2), (3,6), (0,4), (-1,2)}
{(-3,-2), (-2,-1), (0,-1), (0,1), (1,2)}
{(7,3), (-6,8), (-3,5), (0,-3), (7,11)}